CN102974519B - Anticorrosive technology used for marine environment fastener - Google Patents
Anticorrosive technology used for marine environment fastener Download PDFInfo
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- CN102974519B CN102974519B CN201210461640.3A CN201210461640A CN102974519B CN 102974519 B CN102974519 B CN 102974519B CN 201210461640 A CN201210461640 A CN 201210461640A CN 102974519 B CN102974519 B CN 102974519B
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Abstract
The invention aims to provide an anticorrosive technology used for a marine environment fastener. The anticorrosive technology used for the marine environment fastener comprises the following steps of removing oil of workpiece, removing rust, carrying out phosphorization or electric galvanized surface treatment, spraying, airing, drying, and preserving heat. A composite coating of 'electrolytic zinc + Xylan coating' is adopted and is applied to anticorrosion of the marine environment fastener for the first time. An anticorrosive technology of the composite coating has the advantages that water-based paint Xylan1424 is provided with dry film self-lubrication performance; coefficient of friction is from 0.05 to 0.10; relative to a black fastener, torsion is decreased by more than 70%, pre-assumed torque quotient is correctly achieved, and the fastener is convenient to connect. Due to the dry film self-lubrication performance and good anti-rusty performance, the anticorrosive technology used for the marine environment fastener is capable of enabling a screw nut to be dismantled easily by a spanner and avoiding destructive dismantling of an acetylene gun after the marine environment fastener is used for many years.
Description
Technical field
The invention belongs to machanical fastener technical field of surface, especially for marine environment securing member anticorrosion process.
Background technology
Ocean platform is the large-scale offshore steel structure platform of building in order to carry out the industrial activities such as exploration of ocean resources, drilling well, oil recovery, for a long time in salt fog, moisture and seawater, be subject to severe marine environment and corrode for a long time, have a strong impact on the safety of ocean platform and production operation.It is to safeguard the normal vital part moving of ocean platform that ocean platform is installed with various securing members, under abundant electrolyte effect, easily there is violent electrochemical corrosion, corrosion rate is far above land, the problem such as often produce corrosion failure, kill, the maintenance cost of ocean platform is increased, increase the danger of blast.And can not the regular maintenance that lies up as boats and ships due to ocean platform, therefore how to ensure that the problem of securing member antiseptic property has become the key issue that should primarily solve in ocean platform aseptic technic.
For realizing the long-effective corrosion of ocean platform, solve the etching problem that adverse circumstances are brought, the main method of taking at present has two: (1) isolation corrosive medium: be to solve the directly the most effective approach of corrosion, wherein modal mode is anticorrosion with coat, has advantages of that easy construction, cost are relatively cheap.(2) cathodic protection: be to adopt a kind of way of controlling electrochemical metal corrosion, in the galvanic cell forming at cathodic protection system, oxidation reaction is mainly concentrated and occurred on anode, thereby has suppressed the protected metal erosion as negative electrode.These two kinds of ways have been applied for many years on ocean platform, preferably resolve the Anticorrosion of steel construction main body, but have following weak point for securing member, the standard component coating antiseptic of ocean platform:
(1) the large impact of thickness coordinates
For realizing the anticorrosion of equipment surface, conventionally require the thickness of japanning to be not less than 300 μ m, this gives the appearance and size of some machined parts and cooperation is installed and can brings very big impact.Taking diameter as 100mm, the common power transmission shaft that tolerance is h7 is example, and the tolerance of axle itself is 0～0.035mm, after axle finish coatings, can make the diameter of axle at least increase 300 μ m × 2, be 0.6mm, out-of-size requirement far away, brings insurmountable problem can to the assembling of equipment.
(2) mechanical strength is low
Although present coating adopts various resin materials as main film forming matter mostly, there is higher mechanical strength, but with respect to various metal materials, still there is obvious gap, special on some open drive apparatus, as: even if paint in the surfaces such as the gear pair exposing, sprocket wheel, worm screw, also can be after normal operation very quick-wearing totally, the antiseptic effect that cannot bring into normal play.
(3) inapplicable to standard component
For use amount on ocean platform huge all kinds of securing members, standard component, before installing, japanning can be installed in impact, post-coat lacquer is installed and can not be carried out again good surface treatment, affect paint adhesion, and then affect antiseptic effect, for frequent replacing or the parts likely repeatedly dismantling, install, can inevasiblely bring again the problem of japanning damage.
A kind of Xylan coating (Xylan is its trade mark) that China of U.S. good fortune is produced; it is a kind of PTFE corrosion-inhibiting coating; metal surface is carried out after surface treatment, carry out spray process and play the effect of protecting metal, there is excellent Corrosion Protection: the performances such as chemical resistance corrosion.The industry scope that coating covers: securing member, five metals object, petrochemical equipment part, screw, nut, white split nut, timber screw, electronic accessories, ocean member etc.
Although the bolt of Xylan coating coating at present finds broad application in industrial circle.But the bolt directly applying at this coating corrodes defect faster through using to use to exist on offshore petroleum rig.
Summary of the invention
The object of the invention is to provide a kind of for marine environment securing member anticorrosion process.
Briefly: a kind of for marine environment securing member anticorrosion process, it is characterized in that implementing according to following technological process: workpiece oil removing → rust cleaning → phosphatization or electrogalvanizing surface treatment → spray → dry → dry → insulation.
Specifically, described one, for marine environment securing member anticorrosion process, is characterized in that implementing according to following technological process:
(1). oil removing: temperature dipping degreasing in employing, degreaser PH=10, draining after degreasing;
(2) rust cleaning: adopt aluminium oxide sandblast, strengthen adhesive force, reach Sa21/2 level; Or employing pickling impregnation technology, afterwards draining after neutralization, cleaning;
(3). surface treatment: adopt high temperature manganese phosphating liquor phosphatization or adopt electric galvanizing coating;
(4). spraying: aerial spraying Xylan coating, sprays Xylan coating used and add 20-500 gram of film forming agent, 5-10 kilogram pure water preparation according to per kilogram Xylan coating;
(5). dry: dry in the air to dry tack free;
(6). dry: under the workpiece temperature of 200-300 DEG C, dry 60min;
(7). insulation: be incubated about 10 minutes;
(8). cooling; Naturally cool to room temperature.
The present invention adopts " the grand coating of electrogalvanizing+Xylan lion " composite coating, first this composite coating is applied to the anticorrosion of marine environment securing member.This composite coating anticorrosion process advantage: Xylan 1424 water paints have dry film self-lubricating property, coefficient of friction, between 0.05-0.10, with respect to blackout securing member, reduces moment of torsion up to 70%, accurately reaches the torque coefficient of estimating, and facilitates the connection of securing member.Due to dry film self-lubricating property and excellent rustless property, can, after using for many years, easily use spanner to remove nut, avoid using the destructive dismounting of oxycetylene rifle.So just make in oil field or the deathtrap in chemical plant and so on, the safety coefficient of being engaged in sort of activity improves greatly.Coating is compared zinc-plated, significantly improves anti-corrosion capability, antirust and anti-chemical corrosive nature excellence.Xylan1424 adds electrogalvanizing, can test 2500 hours by neutral salt spray, and red rust area is less than 15%.And the test of the neutral salt spray of common electrogalvanizing is generally less than 100 hours.Coating is non-conductive, so can completely cut off the electrochemical corrosion forming due to difference in Electrode Potential between unlike material parts.Continuous firing can reach operating temperature+180 ° C, can be in operating temperature+200 ° C discontinuous operation.This coating has superior anti salt spray corrosion performance, and remarkable Acid Rain performance, and anti-chemical corrosive nature adopt water based paint, VOC (VOC) <3.0 lb/gal.
Brief description of the drawings
Fig. 1: salt spray test is appearance effect contrast after 1000 hours.
Fig. 2: salt spray test is appearance effect after 2500 hours.
Detailed description of the invention
A kind of for marine environment securing member anticorrosion process, it is to implement according to following technological process:
(1). oil removing: temperature dipping degreasing in employing, degreaser PH=10, draining after degreasing;
(2). rust cleaning: adopt aluminium oxide sandblast, strengthen adhesive force, reach Sa21/2 level; Or employing pickling impregnation technology, afterwards draining after neutralization, cleaning;
(3). surface treatment: adopt high temperature manganese phosphating liquor phosphatization or adopt electric galvanizing coating;
(4). spraying: aerial spraying Xylan coating, sprays Xylan coating used and add 20-500 gram of film forming agent, 5-10 kilogram pure water preparation according to per kilogram Xylan coating;
(5). dry: dry in the air to dry tack free;
(6). dry: under the workpiece temperature of 200-300 DEG C, dry 60min;
(7). insulation: be incubated about 10 minutes;
(8). cooling; Naturally cool to room temperature.
Aerial spraying Xylan coating, sprays Xylan coating used and adds 20 grams of acrylic resin film forming agents, 5 kilograms of pure water preparations according to per kilogram Xylan coating.Or
Aerial spraying Xylan coating, sprays Xylan coating used and adds 100 grams of butadiene resin film forming agents, 6 kilograms of pure water preparations according to per kilogram Xylan coating.Or
Aerial spraying Xylan coating, sprays Xylan coating used and adds 300 grams of polyurethane finishing agents, 8 kilograms of pure water preparations according to per kilogram Xylan coating.Or
Aerial spraying Xylan coating, sprays Xylan coating used and adds 500 grams of cellulose nitrate film forming agents according to per kilogram Xylan coating, 10 kilograms of pure water preparations.
Tested and adopted bolt, nut to do respectively salt spray resistance contrast experiment by the offshore oil securing member process marine environment corrosion-inhibiting coating of processing of the present invention, the index of main test has: product appearance, coating layer thickness, adhesive force, curing detection etc.
First group of bolt, nut adopt electrogalvanizing test specimen, and second group of bolt, nut adopt " the grand coating of electrogalvanizing+Xylan lion " coating, dry 30 minutes through 204 DEG C.Coating correlated performance detection mode is as follows:
Coating surface: any surface finish, the phenomenons (according to TM 120A) such as free from admixture pollution, pinprick, orange peel.
Case hardness: use pencil along miter angle, add certain strength, slip over coating surface.From the lower pencil of hardness ratio, until the high pencil of hardness punctures coating, think the hardness of coating be greater than before the hardness of pencil, and be less than the hardness (TM 131A) of current pencil.
Solidify test: Xylan 1424, use the sticky butanone of calico, 50 bouts of wiping back and forth, transfer on calico as qualified taking not show-through and a little color.As found, a large amount of pigment transfers are to calico, even show-through, are considered as solidifying insufficient.(TM?115A)
Adhesive force test: in 1 millimeter of parallel Hua11 road of the every lattice of coating surface, be deep to base material, more vertical Hua11 road, form 100 little lattice.Use 3M adhesive tape, stick along diagonal, pull away fast, repeat 5 times.Whether observe coating peels off.As a lattice coating is peeled off, or little two or three lattice are peeled off and summation area is greater than little lattice, are judged to defective.(TM?132C)
Coating layer thickness: set bolt, cut open along vertical face, measure the thickness of preprocessing layer and dope layer with microscope.（TM?114A）
Salt spray test: salt fog cabinet keeps 35 degrees Celsius of constant temperature, makes mist by 5% NaCl salt solution, is hung in sample in salt fog cabinet by yarn binding foaming, white rust and the red rust situation of routine observation sample surfaces.It is generally acknowledged that white rust is zinc coat corrosion, red rust is the corrosion of iron-based material.Be no more than 15% complete test with red rust area.（ASTM?B-117）
Fig. 1: salt spray test is appearance effect contrast after 1000 hours.In figure, be apply Xylan coating, chromium plating, zinc-plated, galvanizing and there is no surface-treated effect from left to right successively.
Fig. 2: salt spray test is appearance effect after 2500 hours.
Table 4: result of the test
Can see that by upper table the test specimen salt fog performance of submission meets the QAC testing standard of Hua Fu company of the U.S..Test result shows: salt-fog resistant test is after 2500 hours, white rust area 33%, and red rust area is less than 1%, and the red rust area requiring far below Hua Fu company is not more than 15%.
In conjunction with the data of result of the test and Hua Fu company, adopt " the grand coating of electrogalvanizing+Xylan lion " composite coating to start in batches this composite coating on probation and carry out securing member the anticorrosion of foreign environment that navigate.
Claims (1)
1. for a marine environment securing member anticorrosion process, it is characterized in that implementing according to following technological process:
Workpiece oil removing → rust cleaning → electrogalvanizing surface treatment → spray → dry → oven dry → insulation; And each operation controlled condition is:
(1). oil removing: temperature dipping degreasing in employing, degreaser pH=10, draining after degreasing;
(2) rust cleaning: adopt aluminium oxide sandblast, strengthen adhesive force, reach Sa21/2 level; Or employing pickling impregnation technology, afterwards draining after neutralization, cleaning;
(3). surface treatment: adopt electric galvanizing coating;
(4). spraying: aerial spraying Xylan1424 water paint, sprays Xylan1424 water paint used and add 20-500 gram of film forming agent, 5-10 kilogram pure water preparation according to per kilogram 1424 water-based Xylan coating;
(5). dry: dry in the air to dry tack free;
(6). dry: under the workpiece temperature of 200-300 DEG C, dry 60min;
(7). insulation: be incubated 10 minutes;
(8). cooling; Naturally cool to room temperature.
Step (4) used film forming agent is selected from: one or more mixtures in acrylic resin film forming agent, butadiene resin film forming agent, polyurethane finishing agent, cellulose nitrate film forming agent.
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| CN105566974A (en) * | 2016-03-01 | 2016-05-11 | 中山大学惠州研究院 | Method for enhancing adhesion of marine anticorrosive paints |
| CN106086957A (en) * | 2016-08-08 | 2016-11-09 | 常熟市常力紧固件有限公司 | A kind of process of surface treatment of flange face bolt |
| CN107099362A (en) * | 2017-05-26 | 2017-08-29 | 河南职业技术学院 | A kind of body of a motor car hardware antiseptic oil and preparation technology |
| CN107626549B (en) * | 2017-10-19 | 2018-12-28 | 江苏扬瑞新型材料股份有限公司 | A kind of coat processing method |
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| CN109295485A (en) * | 2018-09-28 | 2019-02-01 | 江苏永昊高强度螺栓有限公司 | A kind of electroplating technology of high-strength bolt |
| CN109332131B (en) * | 2018-11-09 | 2022-01-04 | 美钻深海能源科技研发（上海）有限公司 | Process for preventing marine organism corrosion on underwater metal surface layer |
| CN109695033A (en) * | 2018-12-31 | 2019-04-30 | 安徽银龙泵阀股份有限公司 | Valve plate surface corrosion-resistant loses processing method |
| CN114164469B (en) * | 2021-11-12 | 2023-07-04 | 苏州汇仁友紧固件有限公司 | Fastener surface treatment process for improving corrosion resistance |
| CN114602779A (en) * | 2022-03-11 | 2022-06-10 | 昆山优米诺金属科技有限公司 | Anticorrosive spraying process for threaded fastener |
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| CN1039591C (en) * | 1992-09-23 | 1998-08-26 | 中国科学院兰州化学物理研究所 | Wear-resistant corrosion-proof coating solidified at normal temperature |
| US7144637B2 (en) * | 2004-07-12 | 2006-12-05 | Thomae Kurt J | Multilayer, corrosion-resistant finish and method |
| CN102534628B (en) * | 2010-12-29 | 2013-10-23 | 渤海造船厂集团有限公司 | Method for preparing cadmium-zinc-fluorocarbon composite coating of ship fastener |
| CN202149128U (en) * | 2011-06-14 | 2012-02-22 | 潘华贵 | Corrosion-proof tightening piece |
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Effective date of registration: 20191216 Address after: No.112 Wenhua Road, Jinshui District, Zhengzhou City, Henan Province 450000 Patentee after: Xu Hongjiu Address before: 721001, Shaanxi province Baoji city Weibin District Ma Ying Town Guo Village Industrial Park Patentee before: Baoji Senterui Petroleum Machinery Science & Technology Co., Ltd. |
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Effective date of registration: 20200703 Address after: 721000 Baoji Hi-tech Development Zone, Shaanxi Province, Ma Ying Town, Guo Jia Village Industrial Park Patentee after: BAOJI SENTERUI PETROLEUM MACHINERY SCIENCE & TECHNOLOGY Co.,Ltd. Address before: No.112 Wenhua Road, Jinshui District, Zhengzhou City, Henan Province 450000 Patentee before: Xu Hongjiu |
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